Coating section fuel gas infrared drying mechanism

Abstract

The utility model belongs to the technical field of papermaking, and particularly relates to a coating section fuel gas infrared drying mechanism which comprises a first-stage pressure reduction station, the output end of the first-stage pressure reduction station is connected with a second-stage pressure reduction station, and the output end of the second-stage pressure reduction station is connected with a combustion air device. Energy is converted into long-wave rays to dry paper webs, the rays are long in wavelength and higher in penetrating power, the drying capacity for the paper webs is higher, meanwhile, heat generated by combustion can also dry the paper webs, high-temperature tail gas generated by combustion of fuel gas replaces fresh air to enter a hot air box heat exchanger for heat exchange, the requirement for heat exchange energy is reduced, and the heat exchange efficiency is improved. And after electric infrared is replaced by gas infrared, the use amount of the high-pressure steam in the hot air box can be reduced while the drying capacity of the infrared is enhanced, the energy utilization efficiency of the whole coating section is improved, and the effect of saving energy is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a coating section gas infrared drying mechanism. Background Art

[0002] In my country's papermaking industry, there are three main drying methods for the coating section: electric infrared, gas infrared and hot air box. Among them, most companies use a drying method consisting of electric infrared + hot air box.

[0003] The working principle of electric infrared is that electric energy is mainly converted into heat to dry and heat the paper web, and part of the electric energy is converted into short-wave rays to dry the paper surface. High-temperature air is recovered to preheat the fresh air entering the hot air box for heat exchange. This method has weak drying capacity and low energy utilization efficiency in the coating section.

[0004] In order to solve the above problems, a coating section gas infrared drying mechanism is proposed. Utility Model Content

[0005] The utility model aims to provide a coating section gas infrared drying mechanism to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coating section gas infrared drying mechanism, comprising a primary pressure reducing station, the output end of the primary pressure reducing station is connected to a secondary pressure reducing station, the output end of the secondary pressure reducing station is connected to a combustion wind device, the output end of the combustion wind device is connected to a combustion device, the output end of the combustion device is connected to a control cabinet, the output end of the control cabinet is connected to an exhaust device, the output end of the exhaust device is connected to a fire prevention device, the output end of the fire prevention device is connected to an energy recovery device, the combustion wind device includes a direct drive fan motor, a first filter A device, a first shockproof device, a flexible hose, a second filter, a first pressure sensor, a third hand valve, an electric valve, and a first pressure switch. A direct-drive fan motor is fixedly arranged at the front end of the first filter, a second filter is arranged at the front end of the direct-drive fan motor, a first shockproof device is arranged at the lower end of the second filter, a first pressure sensor is fixedly arranged on the right side wall of the first filter, a flexible hose is fixedly arranged on the right side wall of the second filter, an electric valve is arranged on the tube wall of the flexible hose, a third hand valve is fixedly arranged on the right end of the flexible hose, and a first pressure switch is fixedly arranged on the right side wall of the first filter.

[0007] Preferably, the first-level pressure reducing station includes a first hand valve, a gas filter and a pressure reducing valve, the gas filter valve is arranged at the left end of the pressure reducing valve, and the first hand valve is arranged at the right end of the pressure reducing valve.

[0008] Preferably, the secondary pressure reducing station includes a second hand valve, a pressure regulating valve, a ratio control device, an electromagnetic cut-off valve, and a first hose. The electromagnetic cut-off valve is arranged at the right end of the ratio control device, the second hand valve is arranged at the right end of the ratio control device, the pressure regulating valve is arranged at the left end of the ratio control device, and the first hose is arranged at the left end of the pressure regulating valve.

[0009] Preferably, the combustion device comprises a flame controller.

[0010] Preferably, the control cabinet includes an electrical cabinet, a power supply device, a circuit breaker, a timer, a Siemens PLC, an input-output device, a communication component, a display device and a quick-stop emergency button. The power supply device is provided at the left end of the electrical cabinet, the circuit breaker is provided at the right end of the power supply device, the input-output device is provided at the right end of the circuit breaker, the timer is fixedly provided at the right end of the input-output device, the Siemens PLC is provided at the right end of the timer, the communication component is fixedly provided at the right end of the Siemens PLC, the display device is fixedly provided at the upper end of the right side wall of the electrical cabinet, and the quick emergency button is provided at the lower end of the display device.

[0011] Preferably, the exhaust device includes an air nozzle, a belt-driven fan motor, a second shockproof device, a high-temperature resistant flexible hose, an exhaust pressure sensor, an exhaust temperature sensor, a back integrated motor, a temperature sensor, and a second pressure sensor. The second shockproof device is provided at the lower end of the belt-driven fan motor, the front end of the belt-driven fan motor is provided with an air nozzle, the right end of the air nozzle is provided with a high-temperature resistant flexible hose, the front side wall of the belt-driven fan motor is fixedly provided with a back integrated motor, the left side wall of the back integrated motor is fixedly provided with a temperature sensor, the upper side wall of the belt-driven fan motor is fixedly provided with an exhaust pressure sensor, the upper side wall of the belt-driven fan motor is fixedly provided with a second pressure sensor, and the side wall of the air nozzle is fixedly provided with an exhaust temperature sensor.

[0012] Preferably, the fire protection device includes a manual steam valve, a third filter, a steam tank, an inlet steam pipe, a drain valve, a second pressure switch, and a steam spray pipe with a flexible hose. A steam tank is provided at the right end of the third filter, a manual steam valve is fixedly provided at the upper end of the steam tank, an inlet steam pipe is commonly connected between the third filter and the steam tank, a drain valve is provided at the upper end of the third filter, a steam spray pipe with a flexible hose is provided at the left end of the third filter, and a second pressure switch is provided on the pipe wall of the steam spray pipe with the flexible hose.

[0013] Preferably, the energy recovery device includes an air duct, an exhaust fan, a pressure transmitter, and a steam valve. The exhaust fan is fixedly arranged at the left end of the pressure transmitter, the air duct is arranged at the left end of the exhaust fan, and the steam valve is arranged at the right end of the pressure transmitter.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The present application uses a mixture of natural gas and air to burn, converting energy into long-wave radiation to dry the paper web. The radiation has a longer wavelength, stronger penetrating power, and a stronger drying ability for the paper web. At the same time, the heat generated by the combustion will also have a drying effect on the paper web.

[0016] The high-temperature exhaust gas generated by gas combustion replaces fresh air and enters the hot air box heat exchanger for heat exchange, reducing the demand for heat exchange energy, thereby reducing the use of high-pressure steam. After gas infrared replaces electric infrared, it enhances the drying capacity of infrared while reducing the use of hot air box high-pressure steam, thereby improving the energy utilization efficiency of the entire coating section and achieving the effect of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model.

[0018] Figure 2 This is a schematic diagram of the structure of a first-level pressure reducing station;

[0019] Figure 3 This is a schematic diagram of the structure of the secondary pressure reducing station;

[0020] Figure 4 It is a structural schematic diagram of the combustion air device;

[0021] Figure 5 It is a structural schematic diagram of a combustion device;

[0022] Figure 6 It is the structural diagram of the control cabinet;

[0023] Figure 7 is a structural schematic diagram of an exhaust device;

[0024] Figure 8 It is a structural diagram of the fire protection device;

[0025] Fig. 9 This is a schematic diagram of the structure of the energy recovery device.

[0026] In the figure: 1. first-level pressure reducing station, 2. second-level pressure reducing station, 3. combustion air device, 4. combustion device, 5. control cabinet, 6. exhaust device, 7. fire protection device, 8. energy recovery device. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] Example:

[0030] See also Figure 1-9 , the utility model provides a technical solution:

[0031] A coating section gas infrared drying mechanism includes a primary decompression station 1, the output end of the primary decompression station 1 is connected to a secondary decompression station 2, the output end of the secondary decompression station 2 is connected to a combustion wind device 3, the output end of the combustion wind device 3 is connected to a combustion device 4, the output end of the combustion device 4 is connected to a control cabinet 5, the output end of the control cabinet 5 is connected to an exhaust device 6, the output end of the exhaust device 6 is connected to a fire prevention device 7, and the output end of the fire prevention device 7 is connected to an energy recovery device 8.

[0032] The fire prevention device replaces the air around the module with safe low-temperature wet steam to prevent fires. It automatically sprays when the paper is broken or pressed manually. The principle is not to extinguish fires, but to drive away the oxygen around the infrared module with low-temperature wet steam to achieve the purpose of fire prevention. It is unique to the market.

[0033] The function of the energy recovery device is to recover the exhaust gas from the infrared combustion of the 1# coating, 4# coating and 5# coating for the 3# coating hot air box, saving the amount of fresh steam;

[0034] The main function of the control cabinet 5 is to control all infrared operation processes and the communication between the system and the operating console;

[0035] The first-level pressure reducing station 1 is to reduce the gas pressure of the gas main and send it to the pre-coating, back-coating and top-coating gas infrared system; the second-level pressure reducing station 2 is to further reduce the gas pressure entering the gas infrared system and control the ratio of air to gas at the same time; the combustion air system provides air for gas combustion, and controls the gas volume of the second-level pressure reducing station by controlling the air volume; the combustion system is controlled by the flame controller to control the ignition and flame detection of the chassis module; the exhaust system collects the high-temperature exhaust gas generated by combustion, discharges combustion waste and water vapor, and part of the exhaust gas is used to generate additional convection to improve drying efficiency; the fire prevention system replaces the air near the module with wet steam to achieve fire prevention effect; the energy recovery system replaces fresh air with part of the collected exhaust gas;

[0036] Before the transformation, the total power of the electric infrared was 3021kw, and the high-pressure steam consumption was 12.58t / h; after the transformation, the gas power was 3709kw, and the high-pressure steam consumption was 8.06t / h.

[0037] Before the transformation, the total energy consumption of the infrared and hot air box in the coating section was 9530kw / h (converted into energy calculation); the total energy consumption of the infrared and hot air box in the coating section was 6538kw / h (converted into energy calculation). The total energy saving is 2992kw / h.

[0038] Improve the gas infrared drying capacity, reduce the use of high-pressure steam, improve the energy utilization efficiency of the entire coating section, and achieve the effect of energy saving.

[0039] The combustion air device is used to deliver air (oxygen) into the module, filter and supply combustion air, set power, and control power through electromagnetic butterfly valves. A CAS system has two power control loops.

[0040] The main function of the control cabinet 5 is to control all infrared operation processes and the communication between the system and the operating console;

[0041] The first-level pressure reducing station 1 comprises a first hand valve, a gas filter and a pressure reducing valve. The gas filter valve is arranged at the left end of the pressure reducing valve, and the first hand valve is arranged at the right end of the pressure reducing valve.

[0042] The secondary pressure reducing station 2 includes a second hand valve, a pressure regulating valve, a ratio control device, an electromagnetic cut-off valve, and a first hose. The electromagnetic cut-off valve is arranged at the right end of the ratio control device, the second hand valve is arranged at the right end of the ratio control device, the pressure regulating valve is arranged at the left end of the ratio control device, and the first hose is arranged at the left end of the pressure regulating valve.

[0043] The combustion wind device 3 includes a directly driven fan motor, a first filter, a first shockproof device, a flexible hose, a second filter, a first pressure sensor, a third hand valve, an electric valve, and a first pressure switch. The front end of the first filter is fixedly provided with a directly driven fan motor, the front end of the directly driven fan motor is provided with a second filter, the lower end of the second filter is provided with a first shockproof device, the right side wall of the first filter is fixedly provided with a first pressure sensor, the right side wall of the second filter is fixedly provided with a flexible hose, the tube wall of the flexible hose is provided with an electric valve, the right end of the flexible hose is fixedly provided with a third hand valve, and the right side wall of the first filter is fixedly provided with a first pressure switch.

[0044] The combustion device 4 includes a flame controller, the function of which is to provide ignition and flame detection for the chassis module, and data exchange is through PLC or Profibus.

[0045] The control cabinet 5 includes an electrical cabinet, a power supply device, a circuit breaker, a timer, a Siemens PLC, an input-output device, a communication component, a display device and a quick-stop emergency button. A power supply device is provided at the left end of the electrical cabinet, a circuit breaker is provided at the right end of the power supply device, an input-output device is provided at the right end of the circuit breaker, a timer is fixedly provided at the right end of the input-output device, a Siemens PLC is provided at the right end of the timer, a communication component is fixedly provided at the right end of the Siemens PLC, a display device is fixedly provided at the upper end of the right side wall of the electrical cabinet, and a quick emergency button is provided at the lower end of the display device.

[0046] The exhaust device 6 includes an air nozzle, a belt-driven fan motor, a second shockproof device, a high-temperature resistant flexible hose, an exhaust pressure sensor, an exhaust temperature sensor, a back integrated motor, a temperature sensor, and a second pressure sensor. The lower end of the belt-driven fan motor is provided with a second shockproof device, the front end of the belt-driven fan motor is provided with an air nozzle, the right end of the air nozzle is provided with a high-temperature resistant flexible hose, the front side wall of the belt-driven fan motor is fixedly provided with a back integrated motor, the left side wall of the back integrated motor is fixedly provided with a temperature sensor, the upper side wall of the belt-driven fan motor is fixedly provided with an exhaust pressure sensor, the upper side wall of the belt-driven fan motor is fixedly provided with a second pressure sensor, and the side wall of the air nozzle is fixedly provided with an exhaust temperature sensor.

[0047] The fire prevention device 7 includes a manual steam valve, a third filter, a steam tank, an inlet steam pipe, a drain valve, a second pressure switch, and a steam spray pipe with a flexible hose. A steam tank is arranged at the right end of the third filter, a manual steam valve is fixedly arranged at the upper end of the steam tank, an inlet steam pipe is commonly connected between the third filter and the steam tank, a drain valve is arranged at the upper end of the third filter, a steam spray pipe with a flexible hose is arranged at the left end of the third filter, and a second pressure switch is arranged on the pipe wall of the steam spray pipe with the flexible hose.

[0048] The energy recovery device 8 includes an air duct, an exhaust fan, a pressure transmitter, and a steam valve. The exhaust fan is fixedly arranged at the left end of the pressure transmitter, the air duct is arranged at the left end of the exhaust fan, and the steam valve is arranged at the right end of the pressure transmitter.

[0049] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coating section gas infrared drying mechanism, comprising a primary pressure reducing station (1), characterized in that: The output end of the first-level decompression station (1) is connected to a second-level decompression station (2), the output end of the second-level decompression station (2) is connected to a combustion air device (3), the output end of the combustion air device (3) is connected to a combustion device (4), the output end of the combustion device (4) is connected to a control cabinet (5), the output end of the control cabinet (5) is connected to an exhaust device (6), the output end of the exhaust device (6) is connected to a fire prevention device (7), the output end of the fire prevention device (7) is connected to an energy recovery device (8), the combustion air device (3) comprises a direct drive fan motor, a first pass A filter, a first shockproof device, a flexible hose, a second filter, a first pressure sensor, a third hand valve, an electric valve, and a first pressure switch. A direct-drive fan motor is fixedly arranged at the front end of the first filter, a second filter is arranged at the front end of the direct-drive fan motor, a first shockproof device is arranged at the lower end of the second filter, a first pressure sensor is fixedly arranged on the right side wall of the first filter, a flexible hose is fixedly arranged on the right side wall of the second filter, an electric valve is arranged on the tube wall of the flexible hose, a third hand valve is fixedly arranged on the right end of the flexible hose, and a first pressure switch is fixedly arranged on the right side wall of the first filter.

2. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The primary pressure reducing station (1) comprises a first hand valve, a gas filter and a pressure reducing valve, wherein the gas filter valve is arranged at the left end of the pressure reducing valve, and the first hand valve is arranged at the right end of the pressure reducing valve.

3. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The secondary pressure reducing station (2) comprises a second hand valve, a pressure regulating valve, a ratio control device, an electromagnetic cut-off valve, and a first hose, wherein the electromagnetic cut-off valve is arranged at the right end of the ratio control device, the second hand valve is arranged at the right end of the ratio control device, the pressure regulating valve is arranged at the left end of the ratio control device, and the first hose is arranged at the left end of the pressure regulating valve.

4. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The combustion device (4) comprises a flame controller.

5. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The control cabinet (5) comprises an electrical cabinet, a power supply device, a circuit breaker, a timer, a Siemens PLC, an input / output device, a communication component, a display device and a quick stop emergency button. The power supply device is arranged at the left end of the electrical cabinet, the circuit breaker is arranged at the right end of the power supply device, the input / output device is arranged at the right end of the circuit breaker, the timer is fixedly arranged at the right end of the input / output device, the Siemens PLC is arranged at the right end of the timer, the communication component is fixedly arranged at the right end of the Siemens PLC, the display device is fixedly arranged at the upper end of the right side wall of the electrical cabinet, and the quick stop emergency button is arranged at the lower end of the display device.

6. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The exhaust device (6) comprises an air nozzle, a belt-driven fan motor, a second shockproof device, a high-temperature resistant flexible hose, an exhaust pressure sensor, an exhaust temperature sensor, a back integrated motor, a temperature sensor, and a second pressure sensor. The second shockproof device is arranged at the lower end of the belt-driven fan motor, the air nozzle is arranged at the front end of the belt-driven fan motor, the high-temperature resistant flexible hose is arranged at the right end of the air nozzle, the back integrated motor is fixedly arranged on the front side wall of the belt-driven fan motor, the temperature sensor is fixedly arranged on the left side wall of the back integrated motor, the exhaust pressure sensor is fixedly arranged on the upper side wall of the belt-driven fan motor, the second pressure sensor is fixedly arranged on the upper side wall of the belt-driven fan motor, and the exhaust temperature sensor is fixedly arranged on the side wall of the air nozzle.

7. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The fire prevention device (7) comprises a manual steam valve, a third filter, a steam tank, an inlet steam pipe, a drain valve, a second pressure switch, and a steam spray pipe with a flexible hose. The right end of the third filter is provided with a steam tank, the upper end of the steam tank is fixedly provided with a manual steam valve, an inlet steam pipe is commonly connected between the third filter and the steam tank, the upper end of the third filter is provided with a drain valve, the left end of the third filter is provided with a steam spray pipe with a flexible hose, and the pipe wall of the steam spray pipe with the flexible hose is provided with a second pressure switch.

8. A coating section gas infrared drying mechanism according to claim 1, characterized in that: The energy recovery device (8) comprises an air duct, an exhaust fan, a pressure transmitter, and a steam valve. The exhaust fan is fixedly arranged at the left end of the pressure transmitter, the air duct is arranged at the left end of the exhaust fan, and the steam valve is arranged at the right end of the pressure transmitter.

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